include/linux/ceph/mdsmap.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _FS_CEPH_MDSMAP_H
   3 #define _FS_CEPH_MDSMAP_H
   4
   5 #include <linux/bug.h>
   6 #include <linux/ceph/types.h>
   7
   8 /*
   9  * mds map - describe servers in the mds cluster.
  10  *
  11  * we limit fields to those the client actually xcares about
  12  */
  13 struct ceph_mds_info {
  14         u64 global_id;
  15         struct ceph_entity_addr addr;
  16         s32 state;
  17         int num_export_targets;
  18         bool laggy;
  19         u32 *export_targets;
  20 };
  21
  22 struct ceph_mdsmap {
  23         u32 m_epoch, m_client_epoch, m_last_failure;
  24         u32 m_root;
  25         u32 m_session_timeout;          /* seconds */
  26         u32 m_session_autoclose;        /* seconds */
  27         u64 m_max_file_size;
  28         u32 m_max_mds;                  /* size of m_addr, m_state arrays */
  29         int m_num_mds;
  30         struct ceph_mds_info *m_info;
  31
  32         /* which object pools file data can be stored in */
  33         int m_num_data_pg_pools;
  34         u64 *m_data_pg_pools;
  35         u64 m_cas_pg_pool;
  36
  37         bool m_enabled;
  38         bool m_damaged;
  39         int m_num_laggy;
  40 };
  41
  42 static inline struct ceph_entity_addr *
  43 ceph_mdsmap_get_addr(struct ceph_mdsmap *m, int w)
  44 {
  45         if (w >= m->m_num_mds)
  46                 return NULL;
  47         return &m->m_info[w].addr;
  48 }
  49
  50 static inline int ceph_mdsmap_get_state(struct ceph_mdsmap *m, int w)
  51 {
  52         BUG_ON(w < 0);
  53         if (w >= m->m_num_mds)
  54                 return CEPH_MDS_STATE_DNE;
  55         return m->m_info[w].state;
  56 }
  57
  58 static inline bool ceph_mdsmap_is_laggy(struct ceph_mdsmap *m, int w)
  59 {
  60         if (w >= 0 && w < m->m_num_mds)
  61                 return m->m_info[w].laggy;
  62         return false;
  63 }
  64
  65 extern int ceph_mdsmap_get_random_mds(struct ceph_mdsmap *m);
  66 extern struct ceph_mdsmap *ceph_mdsmap_decode(void **p, void *end);
  67 extern void ceph_mdsmap_destroy(struct ceph_mdsmap *m);
  68 extern bool ceph_mdsmap_is_cluster_available(struct ceph_mdsmap *m);
  69
  70 #endif